How to Check if Thunderbolt Port is Working on Windows 10 Devices

To check if a Thunderbolt port is working on Windows 10, open Device Manager, expand System devices, and look for a Thunderbolt Controller (or USB4 Host Router on newer PCs). If its status says “This device is working properly,” Windows sees the port. Then plug in a Thunderbolt device and confirm it appears in the Thunderbolt Control Center app and works.

Applies to: Windows 10 PCs with Thunderbolt 3, Thunderbolt 4 or USB4 ports. Checked on October 9, 2026. Windows 10 reached end of support on October 14, 2025, so newer Thunderbolt drivers and features target Windows 11.

First, confirm the port really is Thunderbolt

Thunderbolt ports use the same USB-C shape as ordinary USB-C ports. Look for a small lightning-bolt icon next to the port, or check your PC’s specifications on the maker’s website. If a port has no Thunderbolt logo, it may be a standard USB-C port that can’t run Thunderbolt docks or displays.

Check the controller in Device Manager

1. Right-click Start and select Device Manager.
2. Expand System devices.
3. Look for an entry such as Thunderbolt(TM) Controller or USB4 Host Router.
4. Double-click it and check Device status on the General tab.

A yellow warning icon or an error code means Windows found the hardware but the driver isn’t working. If there’s no Thunderbolt entry at all, the controller may be turned off in the firmware, or the driver isn’t installed.

Check with Thunderbolt Control Center

1. Open the Thunderbolt Control Center app from the Start menu. If it isn’t there, install it from the Microsoft Store or your PC maker’s support site.
2. Connect a Thunderbolt device, such as a dock or external drive.
3. The device should appear in the app’s list. If asked, choose Always Connect to approve it.

Thunderbolt 3 PCs often require you to approve each new device for security. Until you approve it, the device may charge but not work.

Test the port with a real device

• Connect a device you know works, ideally on another computer, with a cable marked with the Thunderbolt logo.
• Use a short cable for testing. Long or passive cables may only support lower speeds.
• Check what you see: a dock’s USB ports and display working, or an external SSD showing fast transfer speeds, confirms Thunderbolt is active.
• If the device works as a basic USB-C device but not at full speed or with displays, the port, cable or driver isn’t running in Thunderbolt mode.

Update drivers and firmware

• Thunderbolt driver: download it from your PC maker’s support page for your exact model. Generic drivers from Windows Update may not include the full feature set. Install it, then restart the PC.
• Thunderbolt firmware (NVM): many problems are fixed by firmware updates from the PC maker, often bundled with BIOS or UEFI updates. Install these only from your PC maker.
• Dock firmware: docks have their own firmware updates. Check the dock maker’s support site.

Check Thunderbolt settings in the BIOS or UEFI

1. Restart the PC and open the firmware settings, often by pressing F2, F10, F12 or Delete during startup.
2. Find the Thunderbolt section, often under Advanced, Security or Integrated Devices.
3. Make sure Thunderbolt support is enabled.
4. Check the security level. “No Security” or “User Authorization” are common. “Display Port and USB only” or “USB only” blocks Thunderbolt devices.
5. Save and exit.

If the Thunderbolt port still doesn’t work

• Device charges but doesn’t connect: approve it in Thunderbolt Control Center, or check the BIOS security level.
• Port stopped working after a Windows update: reinstall the Thunderbolt driver from your PC maker, then restart.
• Dock’s monitors don’t turn on: update the graphics driver and the dock firmware, and check the dock supports your number of displays.
• Nothing is detected on any device: shut down fully, unplug power for a minute, and try again. If it still fails, the port may need repair.
• Ports turned off on a work PC: your IT team may block them for security. See how to disable USB ports in Windows 10 for how this kind of restriction works.

Frequently asked questions

Why don’t I see a Thunderbolt controller in Device Manager?

Your PC may not have Thunderbolt, the controller may only appear when a device is connected, or it may be disabled in the BIOS. On USB4 PCs, look for USB4 Host Router instead.

Can a cable stop Thunderbolt from working?

Yes. Many USB-C cables only support USB speeds. Use a cable with the Thunderbolt logo, especially for docks and displays.

Is USB4 the same as Thunderbolt?

USB4 is based on Thunderbolt 3 and works with many Thunderbolt devices, but features vary by PC. Thunderbolt 4 ports meet a stricter set of requirements.

How do I check ordinary USB ports?

See how to check USB ports on Windows 11; most steps also apply to Windows 10.